Electric lamp for cinematographic apparatus



March 36, 1926; 1,578,358-

.r-:. c. PENIN ELECTRIC LAMP FOR CINEMATOGRAPHIC APPARATUS Filed Feb.23, 1924 & Attorney.

' Patented Mar. 30, 1926. :3 Mauser-.2 cow UNITED STATES PATENT OFFICE.

EMILE CHRISTIAN PENIN, O1 JOIIiTVILLE-LB-PONT, FRANCE, ASSIGNOR TO PATHECINEMA, ANCIENS ETAIBLISSEMENTS PATHE FBERES, OF PARIS, FRANCE.

ELECTRIC LAMP FOR CINEMATOGRAPHIC APPARATUS.

Application filed February To alike/10m it may concern:

Be it known that I, EMILE CHRISTIAN PfiNIN, a citizen of the FrenchRepublic, residing at Joinville-le-Pon-t, Seine, in the French Republic,have invented new and useful Improvements in Electric Lamps forCinematographic Apparatus, of which the following is a specification.

This invention relates to-improvements or modifications in the deviceobject of my copending patent application filed under No. 580,507. 1

1 Said modifications consist-in disposing on the tenon of the split ringan enlarged part or boss which is fitted into a corresponding openingformed in the socket, which latter also has various longitudinal slotsIt has been in't'act noticed that in the device'set forth in my patentapplication filed under No. 580,507, jarring motion will cause the lampto slide in its socket andhence the filament will get "out of adjustmentwith reference to the optical axis of the'cmematographi-c apparatus. Theimproved device according to the invention obviates this drawback byadding, to the guiding tongue of the ring, the boss forming thestop-piece in conjunction withsthe socket.

In'the appended drawing which shows by way of example a form'ofconstruction of the device according to the invention.-

Fig. 1 shows inelevation the lamp mounted in its socket.

Fig. 2 is an elevational viewon a larger scale of the lamp socket withits ring and the tenon mounted'on the latter. 7

F i 3 is an elevational view of the socket in w iich the lamp ismounted.

Fig. 4 is a horizontal section on the line A--A-of Fig. 3.

As set forth in my patent application filed under No. 580,507, oneplaces, after adjustment, on the base 4 of the lamp a split ring 1provided with the tenon 2, but according to 23, 1924. Serial No. 6 91,532.

' the invention, the tenon 2 has an enlarged part 2.

The socket 7 for receiving the lamp base t is split lengthwise at 8 forpart. of its height so as to form several tongues. One of the slots 8has an opening 9 for receiving. the enlarged part 2 of the guiding tenon2.

it may be understood that when placing the base 4 provided with its ringsoldered previously thereto,-in the socket 7, theenlarged part 2 oithetenon 2 will separate.

the two corresponding tongues of the socket 7 and will fit into theopening 9. W hen the enlarged part, has been engaged in the said opening9, the two tongues of the socket'7 will resume their normal position.The

tenon 2 is now perfectly maintained, and the ar-ring movements can nolonger cause the,

base 4 to slide, since the stop portion formed bv the enlarged part orboss 2 acts in a siiiiiciently strong manner to prevent the same.

Having now describ my invention what I claim as new and desire to secureby Letters Patent'is:

A lighting device for projection apparatusx comprising an ordinary glowlamp, 0. ring secured to the cap of said'lamp, a lug secured on saidring andextending longit'ur dinally on said cap towards the lower partofsaid cap, an enlarged part or boss provided on said lug and alamp-socket on the upper edge of which is adapted to rest the lower edgeofsaid ring, saidf lamp-socket having longitudinal slots so as to formtongues and an opening in one of'sa'id slots in which is adapted to titsaid enlarged-part.

of said lug for ensuring automatically the exact position in height andthe exact angular position of the lamp filament.-

In testimony whereof I have signed my name .to this specification.

I EMILE CHRISTIAN PENIN.

